Steam boiler



G. COOK STEAM BOILER July s, 1924.

Filed Juhu 24 1918 @607:96 6700i?, INVENTORj .d0 O O O O OQ mw I .mw o o.o o n .w A uw .QN M. hl T lll! .lllwlllhlll Wl! IH Il! MIIIM .lllllll uM l. i SQ MV I. H H u M L1 @x Y en. Il H s I mi wh ,Mnl N- l v N mw ha.v Q00 rl., OO oowoooo Q WITNESSES AT'ORNEY July a, 1924.

G. COOK STEAM BOILER Filed June 24 1918 2 Sheets-Sheet 2 sulla'. .r-ra.4

l wm OO0.0000.000.0. m

ATTOR N EY Patented July 8, 1924.

UNITED STAT-Es GEORGE COOK, or BUFFALO, NEW YORK,

STEAM EOILER.

Application led .Tune 24, 1918. 'Serial No. 241,591.

so constructed and'y reinforced that it may' be made of lighter material-than "customary for a desired degree of pressure vand may provide agreater heating surface than is usually provided` in boilers of the typetO which the invention relates. Y

In accordance with the invention the boiler comprises an' inner andanouter shell spaced apart and strengthened by braces with the bracesconstituting the support for the in-` ner shell, said boiler having afire box at one end with water legs enclosing it Vand at or near theotherjend provided with a steam dome through which lthere is passed acorrugated smoke flue.

by water tubes carried at the ends Vbyheads which may be removed fromthe shell, or any one or more of the water tubes may be Y removed, theouter shell having removable head plates whereby the entire face ofeither end of the shell carrying the water tubes may be reached. Tofurther brace the struc' ture, the water tubes', especially in shortboilers, may be traversed by rods, in turn traversing the heads andsecured exterior thereto, or short bolts may connect the end plates ofthe inner shell and the removable heads of the outer shell.

The invention will be best understood from a consideration ofthefollowing detailed descriptionk Vtaken in connection with theaccompanying drawings Aforming part of 'this specification, with theunderstanding, however, that the invention is notjcon- @dei the boiler,

reference to steam 'i water.

' fined to any strict conformity with the show-` ing ofthe drawings butmay be changed and Y modiiedso long as su'chchanges and modif`iication's mark no material departure from' Figure 2 is an elevation ,Qthe re'boxv Figure 3 is across section of the boiler with distant partsomitted. Figure 4 is a section on the line 4 4 o Figure 2j f o -F`igure5 is a detail sectional viewon :a larger scale than the other figures,showing a form of stay bolt.

Figure 6 is :a view Isirriilar to Figure 5, but showinganother form ofstay bolt.

Referring to the drawings, there is shown 'a boiler having two shells 1and?, respectively, the shell 2 being entirelyenclosed in the shell 1.Grdinarilly the shell l'is circular in cross section, uand the shell 2has its top or crown portion more or less flattened, the shell 2 beingotherwise circular in 'cross section. The two shells are'held inapproximately concentric spaced relation by stay bolts 3, 4respectively, l`certain of the b'olts, indicated at 3a, being hollow andclosed at the outer ends by'screw plugs 3b, whereby on the removal of aplug, av pipe may be screwed into the hollow stay bolt 3a and Y Icompressed air or 'steam ymay be forced into rlhe inner shell of theboiler is' traversed the shell 2 for cleaning purposes, as willhereinafter appear. At suitable points in the bottom portionv of theshell 1 are manhole plates 6 and clamps 7 which may be constructed inaccordance' with the usual practice, these manholesV giving access tothe space'between the shells to remove deposits ofmu'd and the like,such space, when the boiler 4is in Operation, being lled with toma-ryandthe tubes 9 may be upset in the holes thus provided. The end platesare secured to therc'orresponding ends ofthe shell 2 by rivets 10 'orinany other appropriate manner.`

Fast .to the ends of the shell" 1 are end plates 11',l each with anopening 12 therethrough 'of sullicient 'size to permit the-en- :tire'shell 2 to Vbe introduced or lremoved through it.- Each opening 12 isnormally Vclosed by a head 13 'held to the end plate 11 as to slant fromone end toward the other. At the higher end the boiler is mounted upon asupport 16 and at the lower end is mounted upon water legs 17 joinedtogether to enclose a fire chamber 18, the water legs communicating withthe space between the two boiler shells 1 and 2. The fire chamber isshown as provided with a grate 19 without any attempt to illustrate anyparticular form of grate. The irefchamber is also provided with a door20 which may follow the customary practice and so needs no descriptionfurther than to state that while the door is shown at the front of thelire chamber it may equally as well be placed at one side thereof.

The outer shell of the boiler is substantially cylindrical, while theinner shell is iiattened at the crown and throughout its length so thata greater water space is provided between the crowns of the inner andouter shells. The inner shell is in communication with the fire chamber,while the outer shell is in communication with the steam dome, theshells being tilted upwardly and away from the fire chamber in such amanner that the greater volume of water in the boiler will be close tothe fire chamber, thereby providing a greater steam space in the outershell near the steam dome.

Extending through each head 13 and through certain ones of the watertubes 9 are rods 21, the water tubes being of sufficient internaldiameter to permit the passage of the rods and leave ample space aboutthem for the flow of water. Surrounding each rod 21, where passingthrough a head 13, is a screw bushing 22 screwed into the head 13 andtraversed by the rod 21, which latter is there threaded for thereception of a nut 23. The bushing 22 is large at its outer end to forma seat 24 for the nut and the eX- terior of the bushing at its outer endis screw threaded to receive a cap 25. In this manner the rods 21 arereadily accessible at any time it is desired to reach them, while thecaps 25 form closures which may readily be made non-leakable.

The rods 21, which serve to hold the heads 13 from bulging, may bereplaced by bolts 26, as shown in Figure 5, these bolts being carried atthe outer ends by bushings 22 provided with caps 25 similarly to theshowing of Figure 6. The bolts are made only long enough to traverse thespace between the head 8 and plate 13 and seat in a bushing 22, eachbolt having a head 27 interior to the plate 8.

Rising from the shell 1 at the end remo from the fire box 18 is a steamdome 28 traversed by a smoke flue 29 which may be made corrugated,thereby increasing its heat-conducting surface and also strengtheningthe structure so that braces may be omitted. The

ing means for steam within the dome 28. The flue 29 may termina-te abovethe dome 28 in a collar 30 to which may be applied a smoke pipe, or, insome cases, the products of combustion may escape to the atmospheredirectly from the collar 30.

Water is introduced into the boiler for a sufficient depth to cover theshell 2, the water being indicated at 31 in Figure 1. Vhen fuel isburning in the fire box 18 the hot products of combustion rise into theshell 2, heating the walls thereof and also heating the water tubes 9,such products of combustion following the tubes 9 until reaching thesmoke iiue 29 and then risingV through the latter to escape to theatmosphere. The hot products of combustion in the re chamber andcirculating about the water tubes 9 and against the inner-walls of theshell 2 heat the water between the shells and in the tubes tothesteaming point, the steam collecting in the steam dome 29 from which thesteam may be taken for useful purposes as is customary. There isprovided a very large heating surface so that steaming may occurrapidly. The tendency of the shells to separate under the steam pressureis resisted by the stay bolts 3 and 4 and braces 15a as well as by therods 21 or stay bolts 26 as the case may be. The extensive connectionsbetween the inner and outer boiler shells and between the heads 13 orbetween said heads i and the plates 8 permit the boiler to resistinternal pressure without the necessity of using metal of the thicknessheretofore employed. By makingthe dome 28 of heavierY material nointerior bracing is needful. This may be readily done because the domeconstitutes but a relatively small part of the boiler and the addedweight represents but a small fractional part of the weight of thelboiler as a whole. The corrugated flue 29 is, because of thecorrugations, resistant to collapsing pressures, and, moreover,compensates for expansion and contraction besides providing a muchgreater radiating surface for a given length.'

The ready accessibility of the stay devices represented by the rods 21'or bolts 26 permits the quick dismantling of those parts of the boilerthrough which the tubes 9 and other interior parts of the boiler must bereached. n

Since the products of combustion move about the tubes 9, deposits ofsoot occur thereony and it becomes necessary to remove such depositsfrom time to time. To do this cap or caps 3b are removed from the hollowstay bolts 3 and a steam or compressed air pipe is connected in placeofa cap 3b, whereby a strong blast may be directed against the sootcovered tubes 9 and the accumulations of soot blown therefrom. Depositsof soot also occur on'the inner` face flue 29 will therefore constitutea Superheat-of the shell 2 beneath the 'flue 29. To yremove suchaccumulations, clean-out passages 32 are provided in traversing relationto the water space between the two shells. These clean-out openings areclosed in any suitable manner when not in use.

- The boiler is susceptible of use for large or small installations andmay be cheaply built as compared with ordinary boiler installations forthe same purpose because the boiler shells may be made of lightermaterial than heretofore without loss of resistance to internalpressure.

What is claimed is In a steam boiler, in combination, a pair l5 ofconcentric shells, a water iirebox adjacent one end of said shells, aplurality of water tubes connected to the end walls of the inner shell,said shells and water tubes beingrinclined upwardly from the ireboX end,a steam dome connected to and projecting upwardly from the uppermost endof the outer shell, a ue passing through the steam dome andcommunicating with the inner shell, and means for maintaining saidshells in spaced relation.

In testimony that I claim the foregoing as my own, I have hereto aflixedmy signature.

GEORGE COOK.

